Curl: (52) Empty reply from server - Using Cassandra DB

I am following the below document.

Somehow I am getting the below message when I try to curl.
curl -i -X GET --url http://localhost:8000/ --header ‘’
curl: (52) Empty reply from server

All other steps worked fine except this one.
below is what I have done successfully so far.
Create a Docker network, Start your database, Prepare your database, Start Kong.
I am using Cassandra.
then the below.
curl -i -X POST --url http://localhost:8001/services/ --data “name=example-service” --data “url=”

curl -i -X POST --url http://localhost:8001/services/example-service/routes --data “hosts[]

Can you guys please through some light on this? Thanks for your time.

Can someone share your inputs on this? Thanks.

Can someone? I really not able to proceed.